About Optics & Photonics TopicsOSA Publishing developed the Optics and Photonics Topics to help organize its diverse content more accurately by topic area. This topic browser contains over 2400 terms and is organized in a three-level hierarchy. Read more.

Topics can be refined further in the search results. The Topic facet will reveal the high-level topics associated with the articles returned in the search results.

Abstract

A crucial issue in optical packet switched (OPS) networks is packet losses at the network layer caused by contentions. This paper presents the network layer packet redundancy scheme (NLPRS), which is a novel approach to reduce the end-to-end data packet loss rate in OPS networks. By introducing redundancy packets in the OPS network, the NLPRS enables a possible reconstruction of data packets that are lost due to contentions. An analytical model of the NLPRS based on reduced load Erlang fix-point analysis is presented. Simulations of an OPS ring network show that the NLPRS is in particular efficient in small networks operating at low system loads. Results also show how the arrival process, packet length distribution, network size and redundancy packet scheduling mechanism influence the NLPRS performance.

Figures (11)

Illustration of the NLPRS. One redundancy packet is created from a set of four data packets at ingress router j. All five packets are transmitted to egress router k. One data packet is dropped in the network due to contention. However, the lost data packet is reconstructed at egress router k using the successful data- and redundancy packet arrivals.

The cumulative packet length distribution before the NLPRS has been applied (a). The cumulative end-to-end delay distribution before the NLPRS has been applied. ρD=0.2, G=7, AM=Poisson, PLD=Deterministic (b).